diff --git a/pyproject.toml b/pyproject.toml
index 9ca924f..6d9e565 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -18,6 +18,9 @@ classifiers = [
 dependencies = []
 requires-python = ">=3.7"
 
+[project.optional-dependencies]
+emoji = ["emoji"]
+
 [project.urls]
 Homepage = "https://git.kj7rrv.com/kj7rrv/gptc"